US Bridges

184th Ave SE over Unnamed Creek

FairPosted for load

King County, Washington · 1.1 MI W of SR-18 · Structure no. 087786000000000

Built
2007
18 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
37 ft
1 main span
Daily traffic
75
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

184th Ave SE over Unnamed Creek is a concrete culvert carrying 184th Ave SE over Unnamed Creek in King County, Washington. It was built in 2007, so it is 18 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 75 vehicles a day, projected to reach 100 by 2039. The structure is 37 ft (11.3 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries184th Ave SE
CrossesUnnamed Creek
Location1.1 MI W of SR-18
RouteCity Street 293
CountyKing County
StateWashington
Coordinates47.38631, -122.09517
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.7 US tons
Inventory rating53.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2019)
Projected traffic100 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 184th Ave SE over Unnamed Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is 184th Ave SE over Unnamed Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does 184th Ave SE over Unnamed Creek carry?

About 75 vehicles per day (2019 count).

How long is 184th Ave SE over Unnamed Creek?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m).

Who owns 184th Ave SE over Unnamed Creek?

It is owned by the City or Municipal Highway Agency.